import { ref, onMounted,computed} from 'vue'

export default function () {

    //数据
    let sum = ref(0)
    let bigSum=computed(()=>{
        return sum.value*10
    })

    //方法
    function changeSum() {
        sum.value += 1
    }
//钩子
onMounted(()=>{
    changeSum()
})
    //向外部提供东西
    return { sum,changeSum,bigSum}
}
